Door-check



(No Model.)

2 SheetsSheet 1.

F. H. OGDEN.

DOOR CHECK. No. 602,688. Patented Apr. 19,1898.

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F. H. OGDEN.

DOOR CHECK.

No. 602,688. Patented Apr. 19, 1898.

RAM Km WITNESSES NI'IED STATES PATENT OFFICE.

FREDERICK H. OGDEN, OF NEW YORK, N. Y., ASSIGNOR TO HENRY ILL ANDCHARLES WINCKLHOFER, OF NEWARK, NEW JERSEY.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 602,688, dated April19, 1898.

Application filed September 1, 1897- Serial No, 650,577. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK H. OGDEN, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Door-Checks; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in door-checks, and particularly tothat class of checks in which a liquid is employed as the resistingmedium; and my invention consists in the novel means employed foroperating the regulating-valve of the check and in the novelcombination,construction,and arrangement of the parts.

The object of my invention is to provide a simple, inexpensive, andeflicient regulatingvalve which may be located in the piston of adoor-check and operated from the outside of the check. This object isattained in the invention herein described, and illustrated in thedrawings which accompany and form a part of this specification, in whichthe same reference-numerals indicate the same or corresponding parts,and in which- Figure 1 is a central vertical section of a door-checkprovided with the improved regulating-valve. Fig. 2 is a detailedsectional View of a portion of the piston, showing the regulating-valveon a larger scale. Fig. 3 is an elevation of the door-check and aportion of a door and door-frame, showing the external appearance of thecheck and the way in which it is attached to the door; and Fig. 4 is acentral vertical section of the lower portion only of the check, showinga slightlydifferent form of regulating-Valve.

The general construction of the door-check herein illustrated is that ofthe check illustrated and described in an application for Letters Patentfiled by me on June 19, 1897, Serial No. 641,434, and I make no claimherein for any such general features of construction, but claim only theregulating-Valve in its combination with the parts of the check withwhich it is combined.

In the drawings, is the main casing of the check, provided with suitableflanges for its attachment to the door 12. is a central shaft orspindle, to which and to the doorframe are connected suitable hingedlevers for operating the check. The casing 10 is divided internally intoan upper or spring chamber 16 and a lower chamber 18, in the upperportion of which are gears and a cam for operating the piston, the lowerportion of this chamber (the Working cylinder proper) being arranged forthe movement Within it of the piston 20. The piston is provided with aneccentric piston-rod 21, which at the top is provided with a projectingstud or cam-piece 22, engaging a cam 23, which is driven from thespindle 15 by the bevel-gears shown.

The cam mechanism for raising and lowering the piston is illustrated anddescribed in Patent No. 525,830, dated September 11, 1894, granted toCharles Wincklhofer for an automatic door-closin g device. ber and theworking chamber are separated by a plate 30, which closes the workingchamber, so that no liquid can pass into the springchamber. Thespring-chamber 16 has a cover 31. A bushing 32, having at its upper endratchet-teeth adapted to be engaged by a suitable pawl, so as to preventrotation of said bushing under the action of the spring, surrounds thestem 15 and has a bearing in the cover 31. The spring 17 is an ordinarycoiled spring, one end of which engages a slot in the bushing, the otherend engaging a slot in the side of the chamber 16.

In piston 20 is a check-valve 35, which permits free passage of liquidfrom the upper side of the piston to the lower side thereof when thepiston rises, but which prevents the passage of liquid through it whenthe piston descends. In the piston there is also a passage 36, arrangedto be partly or completely closed by'a screw valve-plug 37, upon the endof which is a spur-wheel 38, adapted to mesh 'with a pinion-rod 39,which passes through the bottom of the casing of the check and has uponits end a milled head 40. Pinion-rod 39 has also a collar 41 and abushing 42, seated in an opening in the casin g and provided withscrew-threads engaging corresponding screwthreads of the casing, bywhich said pinion- The spring-chamrod is held in place. A suitablepacking material maybe placed between the collar 41 and the bushing 42to prevent the escape of liquid.

The upper end of the pinion-rod 39 enters a socket 43 in the piston 20when the piston is at the lower end of its travel. It is in thisposition that the pinion is in engagement with the spur-wheel 38 of theregulating-screw 37. By turning the milled head 40, therefore,when thedoor is closed and the piston is in its lower position the flow of fluidthrough the passage 36 may be regulated.

When the piston rises, the spur-wheel 38 moves out of engagement withthe pinion 39; but when the piston descends the spur-wheel will againmesh with the pinion. To facilitate the meshing of the spur-teeth of thegear and pinion as the piston descends, the ends of the pinion-teeth arebeveled. If it be thought, however, that it is preferable not to permitthe spur-wheel and pinion to be disengaged, the pinion may be prolonged,as shown in Fig. l, so that in the normal operation of the doorcheck thepiston will never rise so far as vto move the spur-wheel 38 out ofengagement with the pinion.

The passage 36 in the piston is a right-angled passage, so that thepressure as the piston descends is squarely against the side of thescrew 37, and there is no tendency, therefore, due to this pressure forthe screw to revolve and so change the adjustment of the valve.

The operation of the invention is as follows: When the door is opened,the piston is raised, the fluid above the piston passing through thecheck-valve 35 into the space below the piston as the latter rises. Whenthe door is closed, the piston descends and the checkvalve 35 closesautomatically and causes the fluid below the piston to pass through therestricted passage 36 into the space above the piston. As the passage ofthe fluid through this restricted passage is slow, too violent closingof the door is prevented. lVhen the door is closed, the valve in thispassage may be regulated by turning the milled head 40, or if the valvebe constructed as shown in Fig. 4 it may be regulated in any position ofthe door.

This invention is not limited to use in liquid door-checks, but isequally suitable for use in regulating the passage of air through arestricted passage in the piston of a pneumatic door-check.

Having thus completely described my invention, what I claim, and desireto secure by Letters Patent, is

1. In a door-check, the combination, with a working chamber, a pistontherein, and means for reciprocating the same, of a checkvalve adaptedto permit free passage of a liquid or other fluid from one side of thepiston to the other, a valve-plug in said piston adapted to restrict apassage therein through which reverse flow of the fluid may take place,an operating-rod projecting through the wall of the working chamber, andgearing connecting said valve-plug and operating-rod, by which saidvalve-plug may be adjusted, substantially as described.

2. In a door-check, the combination, with a working chamber, a pistontherein, and means for reciprocating the same, of a checkvalve adaptedto permit free passage of a liquid or other fluid from one side of thepiston to the other, a screw in said piston adapted to restrict apassage therein through which reverse flow of the fluid may take place,a gearwheel upon the end of said screw, and an opcrating-rod projectingthrough the Wall of the working chamber, and provided with teeth adaptedto mesh with the teeth of said gearwheel, by which said screw may beadjusted, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK H. OGDEN.

Witnesses:

HARRY M. MARBLE, EDWIN L. KERR.

